Adding support for x-nucleo-bnrg2a1 BLE shield

wim yedema <wim.yedema@...>

Hi All,

I'm working on adding support for the X-NUCLEO-BNRG2A1 ST shield. This would extend the implementation of X-NUCLEO-IDB05A1. The BNRG2A1 shield uses a newer version of the BlueNRG SPI interface, there is overlap, but there are significant differences. Enough that I need to change the implementation of the bt_spi_rx_thread and bt_spi_send. 
I am more than happy to make those changes, but I am unable to test them. How should I go about making these changes? Is anyone willing to test this for me?

Wim Yedema